Sub-GHz Josephson parametric amplifiers for the readout of sensors and quantum dots

Visa Vesterinen, Slawomir Simbierowicz, Leila (Robab) Najafi Jabdaraghi, Leif Grönberg, Janne Lehtinen, Mika Prunnila, Joonas Govenius

Research output: Contribution to conferenceConference AbstractScientificpeer-review


We present our latest experimental results on sub-GHz Josephson parametric amplifiers (JPAs) fabricated with our Nb/Al-AlOx/Nb junction process [1]. The early generation of our flux-driven reflection-type JPA has found applications in the radio-frequency readout of bolometers [2], as well as quantum dots [3]. We have recently addressed bandwidth limitations by engineering a partially reconfigurable impedance transformer. With a bandwidth of 10 MHz at 20 dB gain at 600 MHz, the improved JPA is in line with the requirements of fast readout schemes for, e.g., semiconductor quantum dots. In addition, we have experimented with a variant where unwanted non-linearities are suppressed by alternating the dipolar orientation of superconducting nonlinear asymmetric inductive elements (SNAILs) in an array.
Original languageEnglish
Publication statusPublished - 16 Mar 2021
MoE publication typeNot Eligible
EventAPS March Meeting 2021: Online - Virtual
Duration: 15 Mar 202119 Mar 2021


ConferenceAPS March Meeting 2021
Internet address


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